They have no choice in we're they work, live or take their kids to school or how they get between those places?
Well, in a way people have a choice...but this is the similar naive statement raised regarding 'wild animals in captivity' in the book 'life of Pi' - yes, animals and humans have a degree of freedom in their choices, but were not 100% free to roam the planes/streets doing whatever we wish, are we?!
I can't waltz up to a house in an area I can't afford, and simply state "jog on, I'm living here...". My wife can't speak to the head of her speciality school of training and say "I'm not transferring to this hospital next year, cos I don't want to use my car, move me here" (she can try, but is limited by real factors). I could swap my son from school to school year after year, moving home year after year, just to avoid having to use the car to drop him at school/childcare - but for him which would be more damaging to his development??
I can see you raise a nice point, and in an ideal world people could stick to it, but we clearly live in a more complicated situation than that. This comment is on a similar vain to "why are African people walking 8 miles to a well - move closer to the well dammit....!"
(Oh, neither me or my wife have so much of an ounce of fat on us either...)